_Lath. Synop. Suppl._ A General Synopsis of Birds. By Dr. J. Latham, 3 vols, and 2 Supplements, 4to. London, 1782, &c. ---- _Index Ornith._ Index Ornithologicus, 2 vols. 4to. London, 1790. _Martyn Univ. Conch._ The Universal Conchologist. By T. Martyn, 4 vols. 4to. London, 1784, &c. _Martini._ See Chemnitz. _Pennant._ British Zoology. By T. Pennant, 4 vols. 8vo. London, 1812. _Risso Icth._ Ichtyologie de Nice, 1 vol. 8vo. Paris, 1810. _Rumph._ Thesaurium Imaginum Piscium, &c., folio. Hagae, 1739. _Seba._ Albertus Seba Rerum Naturalium Thesauri, 4 vols. folio. Amsterdam, 1734-1765. _Say._ Description of the Land and Fresh-water Shells of the United States. By Thomas Say. Philadelphia, 1819. _Shaw in Gen. Zool._ See General Zoology. _Temminck Pig. et Gall._ Histoire Naturelle Generale des Pigeons et des Gallinaces. Par C. J. Temminck, 2 vols. 8vo. Amst. 1813. ---- _Manuel._ Manuel d'Ornithologie, 2d edit., 2 vols. 8vo. 1820. _Le Vaill._ Hist. Nat. des Toucans et des Barbus, folio. Paris, 1806. ---- Hist. Nat. des Perroquets, 2 vols. folio. Paris, 1801. _White's Voyage._ Journal of a Voyage to N. S. Wales, 4to. Lond. 1790. * * * * * Pl. 1 [Illustration] PSITTACUS Cayennensis. _Cayenne gold-winged Parakeet._ * * * * * GENERIC CHARACTER. _Rostrum breve, crassum, validissimum, ad basin cute tectum; mandibula superiore adunca; inferiore sub-recurvata, breviore. Nares rotundae, nudae, ferme verticales. Pedes scansorii._ Bill short, thick, very strong, covered at the base by a cere; upper mandible sharply hooked; under mandible obtuse, curving upwards, and much shorter. Nostrils round, naked, nearly vertical. Feet scansorial. * * * * * SPECIFIC CHARACTER. _P. viridis, alis spuriis aurantiis, remigibus exterioribus basi caeruleis, cauda brevi cuneata._ Green Parakeet, with the spurious wings golden-orange: outer quills blue at their base. Tail short, wedged. Le Perruche a tache souci. _Le Vaill. pl._ 58, 59. _p._ 169. * * * * * We only thoroughly identified this beautiful little bird, by an inspection of the costly work of Le Vaillant on this family, in the Banksian Library: for the description of the orange-winged Parakeet of Dr. Latham is not applicable; and Dr. Shaw has persisted in the old error of considering this species a variety of the Toui Parakeet, although the question had been put at rest by the original description and sound reasons of Le Vaillant. There is a wide difference between naturalists who compile, and form their theories from books, and those who study nature, and think for themselves; and nothing will result from the first but mischief to the science, and perplexity to the student.